This book is basically the history of the 500 lb gorilla of the dot-com debacle. It follows Yahoo! from its birth in a Stanford trailer up through the pits of despair in late 2001.
I personally learned quite a bit about the forces that shaped this "walking contradiction" of a company. For me (as a geek) the most interesting part was the history of what technologies and services have been rolled into the Yahoo! brand, including early plays into VoIP as far back as 1998 and Yahoo!'s short fling with adult content.
Lost a star for the (I felt) boring profusion of financial figures every few pages. Yes, the difference between GAAP and pro-forma reporting blah blah and stock rating by Bleedle and Blarney was changed fom zzzzz.... Some of this pure finance speak is obviously necessary to the story, since a lot of the action pivots on economic calamity. It just seemed that the book occasionally became the history of YHOO the stock instead of Yahoo! the company.
For "ancient history" (in Internet time) the book is a great resource. I'll still need something to fill in the gap between the ending of this book (the expectation at end of 2001 that Yahoo! would die, become irrelevant, or get acquired) through modern times. But taken for what it is, it's a handy reference.